And why are the rain streaks so evenly lit across the entire frame? Also, with it being that gloomy, shouldn't there be rain drops being illuminated by the headlight beams way out in front of the loco?

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Rhymes with slice, rice and mice, and probably should be spelled like "Tice."

The latter is a reasonably bright sun setting, no? How do you shoot dark rain conditions at these settings? Maybe using a 3-stop ND filter to lengthen shutter speed? Wait, that makes no sense, that's backwards. I'm confused. Tired, so maybe not thinking clearly.

PS: I am not making any accusation here, I just don't understand the numbers.

William's other work is good, and he's local to me so I'm happy to see him contribute though I think it's time for RP to enforce some rules going forward, or perhaps, once again.

Now - if there were to be a sister site allowing creative edits - would anyone ever come to the original site again? I've seen some amazing edits and HDR's on FB as well as FLICKR and other's personal sites which unfortunately elect to remain vague about what is real and what is not. Lot's of pans out there, lol.

Then again - there are red skies like I've never in my life seen on RP.

Would be nice to have at least one place on the Web grounded in reality, as much fun as a fantasy site would also be.

I'm not particularly good at shooting in the rain, but I have learned a thing or two. If the shutter speed is much more than 1/250th, the rain no longer looks nice and streaky. Instead, you see the individual raindrops, and there is not much to convey motion. It is akin to photographing a helicopter or turboprop aircraft at a high shutter speed. The resulting image just looks strange. Jacking the ISO and stopping down helps as well.

Rain and snow seldom look uniform, like the blurred noise depicted in the link that Mitch sent. Droplets or flakes closer to the lens will look quite different than ones that are farther away. As someone else pointed out, your ability to see them in the image depends upon where you look in the image. If you look at this one of mine, the rain is most apparent when the background is dark, such as the locomotive tender:

It is much harder to see in the lighter areas of the image. Headlights and well-lit smooth surfaces in the foreground will also highlight the rain streaks and the impact splashes that you would normally get in a "gully-washer."

As someone else pointed out, your ability to see them in the image depends upon where you look in the image. If you look at this one of mine, the rain is most apparent when the background is dark, such as the locomotive tender: